private unsafe void CopyToArgbAlpha8(SurfaceData surfaceData)
{
fixed(byte *dataPointer = data)
fixed(ArgbColor * palettePointer = palette)
{
byte *destinationRowPointer = (byte *)surfaceData.DataPointer;
byte *sourceColorPointer = dataPointer;
byte *sourceAlphaPointer = dataPointer + Width * Height;
for (int i = Height; i-- != 0; destinationRowPointer += surfaceData.Stride)
{
ArgbColor *destinationPointer = (ArgbColor *)destinationRowPointer;
for (int j = Width; j-- != 0;)
{
ArgbColor.CopyWithAlpha(destinationPointer++, palettePointer + *sourceColorPointer++, *sourceAlphaPointer++);
}
}
}
}
private unsafe void CopyToArgbTransparent(SurfaceData surfaceData)
{
int rowLength = Width;
fixed(byte *dataPointer = data)
fixed(ArgbColor * palettePointer = palette)
{
byte *destinationRowPointer = (byte *)surfaceData.DataPointer;
byte *sourcePointer = dataPointer;
for (int i = Height; i-- != 0; destinationRowPointer += surfaceData.Stride)
{
ArgbColor *destinationPointer = (ArgbColor *)destinationRowPointer;
for (int j = Width; j-- != 0;)
{
*destinationPointer++ = palettePointer[*sourcePointer++];
}
}
}
}
protected unsafe override void CopyToArgbInternal(SurfaceData surfaceData)
{
switch (AlphaBitCount)
{
case 0: CopyToArgbOpaque(surfaceData); break;
case 1: CopyToArgbAlpha1(surfaceData); break;
case 4: CopyToArgbAlpha4(surfaceData); break;
case 8: if (separateAlpha)
{
CopyToArgbAlpha8(surfaceData);
}
else
{
CopyToArgbTransparent(surfaceData);
} break;
default: throw new NotSupportedException(); // Should never happen…
}
}
protected override void CopyToArgbInternal(SurfaceData surfaceData)
{
throw new NotSupportedException();
}
